From 1940 to 1945, if you wanted to acquire radioactive material in Germany, you didn’t have to engage in cloak-and-dagger shenanigans; you simply had to go to the nearest pharmacy and purchase a tube of Doramad toothpaste.

Doramad was produced with small quantities of radioactive thorium. This wasn’t a manufacturing accident; it was an intentional marketing strategy.

Translation: “Its radioactive radiation increases the defenses of teeth and gums. The cells are loaded with new life energy, the bacteria are hindered in their destroying effect. This explains the excellent prophylaxis and healing process with gingival diseases. It gently polishes the dental enamel so it turns white and shiny. Prevents dental calculus. Wonderful lather and a new, pleasant, mild and refreshing taste. Can be applied sparingly.”

Aside from being the poster child of quack medicine, Doramad played an interesting role in the race to develop the atomic bomb. U.S. intelligence agents were alarmed to learn that unusually-large amounts of thorium were being bought up by Germany. This suggested that German research toward the atomic bomb had progressed further than previously had been thought.

It was only as the war drew to a close that investigators learned the real reason for the thorium shipments. Savvy German entrepreneurs were decades ahead of Dwight D. Eisenhower’s “Atoms for Peace” proposal. They were stocking up on radioactive material so they could make money selling a ground-breaking product. Their marketing slogan was, “Use toothpaste with thorium! Have sparkling, brilliant teeth—radioactive brilliance!”